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Operation and Features
3.7 Digital Shift
The "digital shift" feature allows you to change the group of bits that is output from the ADC. Using
the digital shift feature will effectively multiply the output of the camera by 2 times, 4 times or 8
times. Section 3.7.1 describes how digital shift works when the camera is operating in 10 bit output
mode, and Section 3.7.2 describes how digital shift works when the camera is operating in 8 bit
output mode.
Also note the precautions that you must observe to effectively use this feature (see Section 3.7.3).
You can set digital shift using either the camera configuration tool CCT+ (see Section 4.1 and the
configuration tool's on-line help) or binary commands (see Section 4.2). With the CCT+, you use
the Digital Shift setting on the Output tree to set digital shift. With binary commands, you use the
Digital Shift command.
3.7.1 Digital Shift in 10 bit Output Mode
No Shift
As mentioned in Section 3.1, the A102
ADC to digitize the output from the CCD sensor.
When the camera is operating in 10 bit output
mode, by default, the camera transmits bit 11
through bit 2 from the ADC.
Shift Once
When the camera is set to shift once, the output
from the camera will include bit 10 through bit 1 from
the ADC.
The result of shifting once is that the output of the
camera is effectively doubled. For example,
assume that the camera is set for no shift, that it is
viewing a uniform white target, and that under these
conditions the reading for the brightest pixel is 100.
If you changed the digital shift setting to shift once,
the reading would increase to 200.
Note that if bit 11 is set to 1, all of the other bits will automatically be set to 1. This
means that you should only use the shift once setting when your pixel readings in
10 bit mode with no digital shift are all below 512.
3-20
DRAFT
uses a 12 bit
k
k
BASLER A102
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